Efficient energy management strategy for fuel cell ultracapacitor hybrid system

This paper presents the design of an efficient energy management strategy (EMS) for fuel cell hybrid vehicle (FCHV). The studied hybrid system is composed of fuel cell/ultracapacitor (FC/UC) source allowing increasing both the power capability and the energy capacity of FCHV. The designed EMS uses a wavelet approach to share the power flow between energy generation by sources and traction load. This leads to a natural frequency decomposition of the power demands without slop limitation to provide any load requirement. An analysis of the simulation results is carried out under Matlab / Simulink environment in order to assess the effectiveness and the performance of the proposed control strategy.